Carracerz14 is correct. Once you accepted that JB update you are now stuck on JB. Kinda like when we all updated from GB to ICS and could not go back after we updated. It changes things inside the phone that will not allow it to boot up with out that JB signature.
I did read somewhere that Verizon was helping people out with issues that "updated" to the newest JB when Moto activated the update. If your issue is serious, you may have to check into that option.
I understand I can't go back to ICS. VZ senting me a replacement phone, now I need to unroot the original phone. Can I boot into stock recovery and reinstall original JB ota?